WO2002038357A1

WO2002038357A1 - Injection molding, method for producing injection molding and die for injection molding

Info

Publication number: WO2002038357A1
Application number: PCT/JP2001/007973
Authority: WO
Inventors: Takao Umezawa; Yousuke Fukasawa; Katsuo Matsunaga; Hitoshi Konuma; Yoshihiro Takahashi
Original assignee: Oshima Electric Works Co., Ltd.
Priority date: 2000-11-10
Filing date: 2001-09-13
Publication date: 2002-05-16
Also published as: JP2002144370A; JP4578667B2; US20040061249A1

Abstract

At the time of molding a side winker (1) by die slide injection molding system, a process for building a bulb (3) and a terminal (7) in a housing (4) is provided between a process for separating first and second dies (9, 10) used for primary injection molding of a lens section (2) and the housing (4) as semi-finished products and a process for die sliding and secondary injection molding the lens section (2) and the housing (4) that are abutting against each other so that the bulb (3) and the terminal (7) are not fixed later using a socket, thus molding a side winker (1) with the bulb (3) and the terminal (7) inserted therein.

Description

Description Injection molded article, method for producing injection molded article, and mold for injection molded article

The present invention belongs to the technical field of injection-molded articles to be injection-molded, such as side-winning force, headlamp, tail lamp, and the like, mounted on a vehicle, a method of manufacturing the injection-molded article, and a mold for the injection-molded article. . Background art

In general, as one type of this type of injection molded body, there is a side blinker provided so that the bending direction of the vehicle can be visually recognized from the side of the body. For example, a conventional side blinker includes a lens portion. And a housing into which a light bulb (bulb), which is an electric component having terminals, is formed as a semi-finished product, and these semi-finished products are formed by butt-bonding. As a method for producing a dies, a die slide injection method is known. This is described, for example, in Japanese Patent Publication No. 2-383377, but when molding a side turner using this, the lens unit is placed in a state where the movable mold and the fixed mold are arranged opposite to each other. After molding (primary molding) with the housing and the housing as primary products, the movable mold slides and butts against both primary products, and the resin material is secondarily injected into the concave groove formed on the outer periphery of the abutting surface. The hollow casing is molded (secondary molding).

However, in this case, it is necessary to incorporate a light bulb as a part into the casing, but in the above-mentioned conventional one, an opening is formed in the housing for incorporating a socket to which a light bulb is separately fixed. After the lens is fixed to the housing to form a casing, a socket with a light bulb is attached to the opening in a retrofitting manner, for example, by gluing or twisting (rotating). . For this reason, the method adopting this method not only requires a separate socket and increases the number of parts, but also requires a work process for incorporating the socket. There is. Furthermore, in this case, if airtightness is required to prevent water from entering the casing, it is necessary to insert a sealing material (for example, a 0-ring) between the socket and the opening. There is a problem that the present invention does not solve. Disclosure of the invention

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been created with the object of solving these problems. The first invention is to form a plurality of semi-finished products by primary injection, In the method for manufacturing an injection-molded article, in which the semi-finished products obtained as described above are butt-jointed and then secondarily ejected to the butt portion to be integrated, the primary A method for manufacturing an injection-molded article, characterized by providing a step of incorporating an electric component into a part-incorporating part in at least one semi-finished product formed by injection.

Further, the second invention is configured such that a plurality of semi-finished products are individually molded by primary injection, the molded semi-finished products are butted together, and then secondarily injected into the butted portion to be integrated. In the injection molded article, at least one semi-finished product molded by the primary injection is integrally formed with a built-in portion for incorporating an electric component.

Still further, in a third aspect of the present invention, after a plurality of semi-finished products are molded by primary injection, parts are incorporated in at least one of the molded semi-finished products, and then the semi-finished products are butted together. In a mold for an injection molded body for integrally forming an injection product by secondary injection into a part, a mold for forming a semi-finished product by the primary injection includes a built-in mold part for forming a built-in part of a part. This is a mold for an injection-molded article, characterized in that a mold is formed.

In this, the component to be incorporated in the semi-finished product is an electric component having terminals, and the mold for molding the semi-finished product by the primary injection includes, in addition to the built-in mold portion for forming the integrated portion of the electric component, Further, an insertion hole type portion for forming an insertion hole for a terminal projecting from the electric component, and a primary injection material is restricted from being injected into the insertion hole type portion in a primary injection step. And a regulating part for forming it can.

In the present invention, an injection-molded article in which components are integrated can be easily manufactured by a die-sliding process, thereby eliminating the need for a socket 0-ring or the like. In addition, retrofitting of parts can be dispensed with.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view of a side blinker.

FIG. 2 is a bottom view of the side blinker.

FIG. 3 is a cross-sectional view of the side blinker.

FIG. 4 is a longitudinal sectional view of the side blinker.

FIG. 5 is an enlarged sectional view of each of the embodiments (A) to (E) of the mold portion at the partitioning portion of the housing. (F) is a cross-sectional view of the housing, and the part surrounded by 〇 is a partition part.

6 (A) to 6 (C) are schematic explanatory diagrams showing the first half of the process state of die slide injection.

FIGS. 7 (A) to 7 (D) are schematic explanatory views showing the process states in the latter half of die slide injection.

Fig. 8 (A) is an enlarged vertical sectional view of the bulb mounting part of the housing, (B) is an enlarged cross-sectional view of the same, (C) is an enlarged plan view of the bulb mounting part of the housing, and (D) is the bulb and the terminal. An enlarged side view showing an assembled state, and (E) is a front view of the same.

FIG. 9 is a schematic explanatory view showing steps of die slide injection according to the second embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings. In the drawing, 1 is a side win force, and the side winker 1 is composed of a lens portion 2 and a housing 4 in which a bulb 3 is incorporated. The lens portion 2 and the housing 4 are half-split products. A fixed product and a movable product are joined as a certain primary product (semi-finished product). Each is molded by primary injection molding, and then the movable product is slid and moved. The product is molded by the conventionally known die slide injection method in which the resin material 5 is molded by injecting the resin material 5 into the butted surfaces after the products are butted together. Omitted.

The lens portion 2 formed by the primary injection molding has a bowl shape, and the opening edge 2a is substantially horizontal. On the other hand, the housing 4 is composed of a socket part (built-in part) 6 described later into which a light bulb (bulb) 3 is incorporated, and a flange part 4 a projecting from an outer peripheral edge of the socket part 6 in a horizontal (left-right direction) bowl shape. Although integrally formed, the opening end edge 2a is butted against the opening edge 4b of the flange portion 4a in a surface contact manner, and the resin material 5 is secondarily formed at a part of the corner of the abutting surface. It is projected and integrated.

The socket part 6 is formed by a cylindrical part 6a formed so as to protrude into and out of the housing 4, and a partition part 6b that partitions the cylindrical part 6a. Is formed with a through-hole 6c through which a pair of terminals 7 connected to the light bulb 3 penetrates.A portion 6d of the cylindrical portion 6a outside the partition 6b is provided with a power supply connector. 8 can be fitted. On the other hand, a terminal support portion 6f for inserting and supporting the terminal Ί is formed in a portion 6e inside the partition portion 6b in the cylindrical portion 6a. The terminal 7 and the light bulb 3 are assembled into the housing 4 during a step of abutting the lens unit 2 and the housing 4 after a primary injection step described later. In the present embodiment, the terminal 7 and the light bulb 3 are used. And a pair of terminals are inserted separately from the inside of the housing, and then inserted into the lamp holder 7a formed on the terminal 7 and the base end of the lamp. It can be attached by inserting 3a. By the way, in the present embodiment, the bulb 3 and the terminal 7 are separated from each other. However, an assembly in which the bulb and the terminal are integrated in advance can be used. It just needs to be.

Reference numerals 9 and 10 denote die slide injection dies employed in the present embodiment. Here, a first die 9 which is a fixed die, and upper and lower and The second mold 10 is configured to be movable in the left-right direction. In these first and second molds 9 and 10, molds for forming the lens portion 2 and the housing 4 in the primary injection step are formed, but in order to form the housing 4, The following considerations have been made for the type: Here, the first mold 9 is for molding the outer surface of the housing 4, and the second mold 10 is for molding the inner surface of the housing 4. Each of the mold portions for forming the mold 6 is formed. Further, the first mold 9 has an insert for inserting and supporting a tip portion 7 b projecting outward from the partition portion 6 b of the terminal 7 described above. A hole 9a is formed. On the other hand, in the second mold 10, an injection restricting portion 10 a for closing the support hole 9 a and restricting the injection of the primary injection material at the time of the primary injection is formed in a convex shape. .

FIG. 5 shows an example of the injection regulating section 10a described above. First, in (A), the thickness of the restricting portion 10a is made to match the inner surface size of the insertion hole 9a, and is inserted so as to extend beyond the partition 6b. . In the case of (B), the thickness of the restricting portion 10a is larger than the inner surface of the insertion hole 9a, and the restricting portion 10a is inserted beyond the partition portion 6b. In the case of (C), the thickness of the regulating portion 10a is larger than the inner surface dimension of the insertion hole 9a, but is inserted to the outer surface position of the partition portion 6b. In the case of (D), the tip of the restricting portion 10a, which is thicker than the inner surface dimension of the insertion portion 9a, is formed in a mountain shape (tapered shape, Λ shape), and the tip is a corresponding portion of the first mold 9. The surface is brought into contact with the surface. Such consideration is to prevent the resin material from entering the inlet 9a during the primary injection, and any of them can be adopted. Furthermore, as shown in (E), a pin (plate) -shaped movable die 9 b that protrudes and retracts into the insertion hole 9 a is provided on the first die 9 side in place of the restricting portion 10 a. It can also be implemented.

FIG. 6 and FIG. 7 show a molding procedure using the die slide projection of the present invention. First, as shown in FIG. 6 (A), primary injection is performed in a state where the first and second molds 9 and 10 are abutted, whereby the lens unit 2 and the housing 4 are semi-finished products. Molded. Next, as shown in FIG. 6 (B), these molds 9 and 10 are separated from each other. At this time, the housing 4 is provided on the first mold 9 side and the lens portion is provided on the second mold 10 side. 2 is die-cut with the mold matched. Thereafter, as shown in FIG. 6 (C), the mold is moved so that the lens portion 2 and the housing 4 face each other, and in the present embodiment, as shown in FIG. At this stage, the terminal 7 and the bulb 3 are assembled in the housing 4. And shown in Fig. 7 (B). The first and second molds 9 and 10 are mated so that the housing 4 and the lens unit 2 abut, and then, as shown in FIG. 5 is injected secondarily, and is removed from the mold as shown in FIG.

Incidentally, the terminal 7 and the bulb 3 are assembled into the housing from the step of separating the molds 9 and 10 after the first injection in FIG. 6 (B) and the housing 4 in FIG. 7 (B). Any setting may be made before the step of abutting with the lens portion 2, and these settings can be appropriately performed as necessary. In addition, since the movement of the dies 9 and 10 is sufficient if the primary products are abutted at the time of the secondary injection, the dies 9 and 10 may be moved relative to each other, and the movement relationship between the dies 9 and 10 is as described above. It is needless to say that the opposite of the one described, and the one in which both dies move, etc., can be implemented as needed.

In the device configured as described above, the lens portion 2 and the housing 4 are molded in the primary injection step, and after the lens portion 2 and the housing 4 are abutted, the resin material 5 is secondarily injected into the abutted portion. Although the bulb 3 and the terminal 7 are not retrofitted by using a socket as a separate member, the bulb 4 and the terminal 7 are not connected to the housing 4 until the step of abutting after the step of primary injection. After being incorporated into the integrally formed socket portion 6 from the inside of the housing 4, the lens portion 2 and the housing 4 are abutted against each other and then subjected to secondary injection. As a result, the socket in which the bulb 3 and the terminal 7 are incorporated is not required as a separate member, so that not only the number of parts can be reduced, but also the socket assembling process becomes unnecessary and the cost can be reduced. In this case, since the socket portion 6 is formed integrally with the housing 4, waterproof measures at the portion are not necessary as in the case where the socket portion is separately mounted, and a 0-ring / sealing material for water prevention is also unnecessary.

Moreover, in this device, a through hole 6c for projecting the terminal 7 to the outside is formed in the socket portion 6 of the housing 4 in the primary injection step, while the terminal projecting to the outside in the secondary injection step. A through hole 9a for inserting the tip 7b is formed in the first die 9, whereby the bulb 3 and the terminal 7 are inserted in a series of steps of die slide injection. Incorporation becomes possible.

The present invention provides a die slide injection method using the first and second molds. It is needless to say that the present invention is not limited to the formula, and as in the second embodiment shown in FIG. 9, the first, second, and third molds 11, 12, and 13 are used. In the first injection step, the lens unit 2 is molded by the first and second molds 11 and 12, and the housing 4 is molded by the second and third molds 12 and 13. After separating the dies 11, 12, and 13, the second dies 12 are removed, and then the first and third dies 11, 13 are abutted for secondary injection. The present invention can also be applied to a device in which the lens unit 2 and the housing 4 are integrally formed to form a lamp. In this case, assembling the bulb 3 to the housing 4 starts from the stage where the primary injection has been completed and the respective dies 11, 12, 13 are separated from the lens portion 2 before the secondary injection. This can be performed up to the stage where the housing 4 is abutted.

Furthermore, in each of the above-described embodiments, the side blinker, which is one of the lamps, is described. However, it is needless to say that the present invention is not limited to the lamp, and that the present invention is not limited to the lamp. It is suitable for interior parts, especially relays and other external connection terminals that protrude from the body and are externally connected. Regardless of the external connection method of the terminals, if this is a relay, it is a semi-finished product A relay base in which a bobbin on which a coil is wound is mounted as an electrical component, and a relay cover which is fixed to the relay base so as to cover the coil bobbin, may be used. The invention can be put into practice. The number of components to be installed is not limited to one, but may be plural. Industrial applicability

According to the present invention, a plurality of semi-finished products are formed in a primary injection step, and after the semi-finished products are butted, a resin material is secondarily injected into the butted portion to be integrated. After the primary injection process and before the butting process, the parts to be incorporated into the product are assembled from the inside of one of the semi-finished products from the inside of the other semi-finished product before the butting process, and then Injection and secondary injection can be performed against semi-finished products, and it is not necessary to use separate parts for the built-in parts. Not only can the number of parts be reduced, but also the process of mounting the parts becomes unnecessary and the cost is reduced. It is. Also, it is not necessary to take waterproof measures at this part as if it were attached separately. O-rings and seals are not required. In particular, when the built-in component is a light bulb or a terminal, a through-hole for projecting the terminal to the outside is formed in the socket portion of the housing in the primary injection process, while the terminal tip projecting to the outside in the secondary injection process. Since the through hole for inserting the part is formed in the first mold, it becomes possible to insert and insert the light bulb and the terminal in a series of steps of die slide injection.

Claims

The scope of the claims

1. A method of manufacturing an injection-molded article in which a plurality of semi-finished products are individually molded by primary injection, the molded semi-finished products are abutted against each other, and then secondary injected into the abutting portion to be integrated. The method for producing an injection-molded article according to claim 1, further comprising a step of incorporating a part into a part-incorporating part in at least one semifinished product formed by the primary injection between the primary injection step and the butting step. .

2. A plurality of semi-finished products are individually molded by primary injection, the molded semi-finished products are abutted against each other, and then the secondary injection is performed at the abutting portion to integrally form the semi-finished products. An injection-molded body, characterized in that at least one semi-finished product formed by the primary injection is integrally formed with a built-in portion for mounting a part.

3. After a plurality of semi-finished products are molded by primary injection, parts are incorporated into at least one of the molded semi-finished products. Then, the semi-finished products are butted together, and the secondary injection is performed at the butted portion. In a mold for an injection-molded body for integrally forming a product, a mold for molding a semi-finished product by the primary injection has a built-in mold part for forming a built-in part of a part. Characteristic mold for injection molding ο

4. The part according to claim 3, wherein the part to be incorporated in the semi-finished product is an electric part having terminals, and the mold for molding the semi-finished product by the primary injection includes a part other than the built-in mold part for forming the incorporated part of the electric part. Further, an insertion hole type portion for forming an insertion hole for a terminal protruding from the electric component, and a primary injection material is restricted from being injected into the insertion hole type portion in a primary injection step. A mold for an injection-molded body, wherein the mold is formed with a regulating portion for performing the molding.